move libudev based code into libapt cdrom.cc class

apt-pkg/cdrom.cc

@@ -16,7 +16,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <algorithm>
-
+#include <dlfcn.h>
 
 #include "indexcopy.h"
 
@@ -844,3 +844,82 @@ bool pkgCdrom::Add(pkgCdromStatus *log)
 
    return true;
 }
+
+
+pkgUdevCdromDevices::pkgUdevCdromDevices() 
+  : libudev_handle(NULL)
+{
+
+}
+
+bool
+pkgUdevCdromDevices::Dlopen()
+{
+   // see if we can get libudev
+   void *h = ::dlopen("libudev.so.0", RTLD_LAZY);
+   if(h == NULL)
+      return false;
+
+   // get the pointers to the udev structs
+   libudev_handle = h;
+   udev_new = (udev* (*)(void)) dlsym(h, "udev_new");
+   udev_enumerate_add_match_property = (int (*)(udev_enumerate*, const char*, const char*))dlsym(h, "udev_enumerate_add_match_property");
+   udev_enumerate_scan_devices = (int (*)(udev_enumerate*))dlsym(h, "udev_enumerate_scan_devices");
+   udev_enumerate_get_list_entry = (udev_list_entry* (*)(udev_enumerate*))dlsym(h, "udev_enumerate_get_list_entry");
+   udev_device_new_from_syspath = (udev_device* (*)(udev*, const char*))dlsym(h, "udev_device_new_from_syspath");
+   udev_enumerate_get_udev = (udev* (*)(udev_enumerate*))dlsym(h, "udev_enumerate_get_udev");
+   udev_list_entry_get_name = (const char* (*)(udev_list_entry*))dlsym(h, "udev_list_entry_get_name");
+   udev_device_get_devnode = (const char* (*)(udev_device*))dlsym(h, "udev_device_get_devnode");
+   udev_enumerate_new = (udev_enumerate* (*)(udev*))dlsym(h, "udev_enumerate_new");
+   udev_list_entry_get_next = (udev_list_entry* (*)(udev_list_entry*))dlsym(h, "udev_list_entry_get_next");
+   udev_device_get_property_value = (const char* (*)(udev_device *, const char *))dlsym(h, "udev_device_get_property_value");
+
+   return true;
+}
+
+vector<CdromDevice>
+pkgUdevCdromDevices::Scan()
+{
+   vector<CdromDevice> cdrom_devices;
+   struct udev_enumerate *enumerate;
+   struct udev_list_entry *l, *devices;
+   struct udev *udev_ctx;
+
+   if(libudev_handle == NULL)
+      return cdrom_devices;
+
+   udev_ctx = udev_new();
+   enumerate = udev_enumerate_new (udev_ctx);
+   udev_enumerate_add_match_property(enumerate, "ID_CDROM", "1");
+
+   udev_enumerate_scan_devices (enumerate);
+   devices = udev_enumerate_get_list_entry (enumerate);
+   for (l = devices; l != NULL; l = udev_list_entry_get_next (l))
+   {
+      CdromDevice cdrom;
+      struct udev_device *udevice;
+      udevice = udev_device_new_from_syspath (udev_enumerate_get_udev (enumerate), udev_list_entry_get_name (l));
+      if (udevice == NULL)
+	 continue;
+      const char* devnode = udev_device_get_devnode(udevice);
+      const char* mountpath = udev_device_get_property_value(udevice, "FSTAB_DIR");
+
+      // fill in the struct
+      cdrom.DeviceName = string(devnode);
+      if (mountpath) {
+	 cdrom.MountPath = mountpath;
+	 cdrom.Mounted = true;
+      } else {
+	 cdrom.Mounted = false;
+	 cdrom.MountPath = "";
+      }
+      cdrom_devices.push_back(cdrom);
+   } 
+   return cdrom_devices;
+}
+
+
+pkgUdevCdromDevices::~pkgUdevCdromDevices()
+{ 
+   dlclose(libudev_handle);
+}

apt-pkg/cdrom.h

@@ -67,5 +67,41 @@ class pkgCdrom
 };
 
 
+// class that uses libudev to find cdrom devices dynamically
+struct CdromDevice
+{
+   string DeviceName;
+   bool Mounted;
+   string MountPath;
+};
+
+class pkgUdevCdromDevices
+{
+ protected:
+   // libudev dlopen stucture
+   void *libudev_handle;
+   struct udev* (*udev_new)(void);
+   int (*udev_enumerate_add_match_property)(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
+   int (*udev_enumerate_scan_devices)(struct udev_enumerate *udev_enumerate);
+   struct udev_list_entry* (*udev_enumerate_get_list_entry)(struct udev_enumerate *udev_enumerate);
+   struct udev_device* (*udev_device_new_from_syspath)(struct udev *udev, const char *syspath);
+   struct udev* (*udev_enumerate_get_udev)(struct udev_enumerate *udev_enumerate);
+   const char* (*udev_list_entry_get_name)(struct udev_list_entry *list_entry);
+   const char* (*udev_device_get_devnode)(struct udev_device *udev_device);
+   struct udev_enumerate *(*udev_enumerate_new) (struct udev *udev);
+   struct udev_list_entry *(*udev_list_entry_get_next)(struct udev_list_entry *list_entry);
+   const char* (*udev_device_get_property_value)(struct udev_device *udev_device, const char *key);
+   // end libudev dlopen
+   
+ public:
+   pkgUdevCdromDevices();
+   virtual ~pkgUdevCdromDevices();
+
+   // try to open 
+   bool Dlopen();
+   vector<CdromDevice> Scan();
+};
+
+
 
 #endif

apt-pkg/makefile

@@ -15,7 +15,7 @@ LIBRARY=apt-pkg
 LIBEXT=$(GLIBC_VER)$(LIBSTDCPP_VER)
 MAJOR=4.7
 MINOR=0
-SLIBS=$(PTHREADLIB) $(INTLLIBS) -lutil
+SLIBS=$(PTHREADLIB) $(INTLLIBS) -lutil -ldl
 APT_DOMAIN:=libapt-pkg$(MAJOR)
 
 # Source code for the contributed non-core things

methods/cdrom.cc

@@ -25,23 +25,6 @@
 
 using namespace std;
 
-struct udev;
-struct udev_list_entry;
-
-// libudev dlopen stucture
-struct udev_p {
-      struct udev* (*udev_new)(void);
-      int (*udev_enumerate_add_match_property)(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
-      int (*udev_enumerate_scan_devices)(struct udev_enumerate *udev_enumerate);
-      struct udev_list_entry *(*udev_enumerate_get_list_entry)(struct udev_enumerate *udev_enumerate);
-      struct udev_device *(*udev_device_new_from_syspath)(struct udev *udev, const char *syspath);
-      struct udev *(*udev_enumerate_get_udev)(struct udev_enumerate *udev_enumerate);
-      const char *(*udev_list_entry_get_name)(struct udev_list_entry *list_entry);
-      const char *(*udev_device_get_devnode)(struct udev_device *udev_device);
-      struct udev_enumerate *(*udev_enumerate_new) (struct udev *udev);
-      struct udev_list_entry *(*udev_list_entry_get_next)(struct udev_list_entry *list_entry);
-};
-
 class CDROMMethod : public pkgAcqMethod
 {
    bool DatabaseLoaded;
@@ -49,7 +32,6 @@ class CDROMMethod : public pkgAcqMethod
    string CurrentID;
    string CDROM;
    bool MountedByApt;
-   vector<string> CdromDevices;
  
    virtual bool Fetch(FetchItem *Itm);
    string GetID(string Name);
@@ -69,42 +51,6 @@ CDROMMethod::CDROMMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly |
                                           DatabaseLoaded(false), 
                                           MountedByApt(false)
 {
-   // see if we can get libudev
-   void *h = dlopen("libudev.so.0", RTLD_LAZY);
-   if (h) {
-      // the pointers for the udev struct
-      struct udev_p p;
-      p.udev_new = (udev* (*)(void)) dlsym(h, "udev_new");
-      p.udev_enumerate_add_match_property = (int (*)(udev_enumerate*, const char*, const char*))dlsym(h, "udev_enumerate_add_match_property");
-      p.udev_enumerate_scan_devices = (int (*)(udev_enumerate*))dlsym(h, "udev_enumerate_scan_devices");
-      p.udev_enumerate_get_list_entry = (udev_list_entry* (*)(udev_enumerate*))dlsym(h, "udev_enumerate_get_list_entry");
-      p.udev_device_new_from_syspath = (udev_device* (*)(udev*, const char*))dlsym(h, "udev_device_new_from_syspath");
-      p.udev_enumerate_get_udev = (udev* (*)(udev_enumerate*))dlsym(h, "udev_enumerate_get_udev");
-      p.udev_list_entry_get_name = (const char* (*)(udev_list_entry*))dlsym(h, "udev_list_entry_get_name");
-      p.udev_device_get_devnode = (const char* (*)(udev_device*))dlsym(h, "udev_device_get_devnode");
-      p.udev_enumerate_new = (udev_enumerate* (*)(udev*))dlsym(h, "udev_enumerate_new");
-      p.udev_list_entry_get_next = (udev_list_entry* (*)(udev_list_entry*))dlsym(h, "udev_list_entry_get_next");
-      struct udev_enumerate *enumerate;
-      struct udev_list_entry *l, *devices;
-      struct udev *udev_ctx;
-
-      udev_ctx = p.udev_new();
-      enumerate = p.udev_enumerate_new (udev_ctx);
-      p.udev_enumerate_add_match_property(enumerate, "ID_CDROM", "1");
-
-      p.udev_enumerate_scan_devices (enumerate);
-      devices = p.udev_enumerate_get_list_entry (enumerate);
-      for (l = devices; l != NULL; l = p.udev_list_entry_get_next (l))
-      {
-	 struct udev_device *udevice;
-	 udevice = p.udev_device_new_from_syspath (p.udev_enumerate_get_udev (enumerate), p.udev_list_entry_get_name (l));
-	 if (udevice == NULL)
-	    continue;
-	 const char* devnode = p.udev_device_get_devnode(udevice);
-	 //std::cerr << devnode  << std::endl;
-	 CdromDevices.push_back(string(devnode));
-      } 
-   }
 
 
 };

test/makefile

@@ -68,6 +68,12 @@ SLIBS = -lapt-pkg
 SOURCE = hash.cc
 include $(PROGRAM_H)
 
+# Program for testing udevcdrom
+PROGRAM=test_udevcdrom
+SLIBS = -lapt-pkg 
+SOURCE = test_udevcdrom.cc
+include $(PROGRAM_H)
+
 # Program for checking rpm versions
 PROGRAM=rpmver
 SLIBS = -lapt-pkg -lrpm

test/test_udevcdrom.cc

@@ -0,0 +1,19 @@
+#include <apt-pkg/cdrom.h>
+#include <stdio.h>
+#include <assert.h>
+
+int main()
+{
+   int i;
+   pkgUdevCdromDevices c;
+   assert(c.Dlopen());
+
+   vector<CdromDevice> l;
+   l = c.Scan();
+   assert(l.size() > 0);
+   for (i=0;i<l.size();i++)
+      std::cerr << l[i].DeviceName << " " 
+		<< l[i].Mounted << " " 
+		<< l[i].MountPath << std::endl;
+   
+}